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  • Humpback Whale (Megaptera novaeangliae). A male surfaces during a rowdy group session where males are chasing females to breed.
    D115483.jpg
  • Dr. Steven Amstrup and assistant Karyn Rode prepare a large male polar bear for scientific data collection they perform out on the ice of the Bering Sea. This large specimen was captured after being immobilized with a dart from a helicopter. This adult male wasn't even over 1,000 pounds, unlike many Dr. Amstrup captured in the 1980s that would tip the scales considerably over that 1,000-pound mark. Alaska
    D125246.jpg
  • A large male African leopard (Panthera pardus) running after a fight with another male. Mala Mala Game Reserve,  Great Limpopo Transfrontier Park, South Africa
    D1426198.jpg
  • Common eider (Somateria mollissima) male. Svalbard, Norway
    D1895119.jpg
  • A male rock ptarmigan in breeding plumage on the tundra. Alaska
    D258506.jpg
  • Humpback Whale (Megaptera novaeangliae). A male chases a female during mating season.
    D115289.jpg
  • A male Arctic tern (Sterna paradisaea) drops off a small bug of some sort to a female on a rock. Svalbard, Norway
    D1902200.jpg
  • Arctic tern (Sterna paradisaea) male bringing a small fish to a female during courtship time. Svalbard, Norway
    D1903105.jpg
  • Large male polar bears (Ursus maritimus) play fighting in Churchill, Manitoba, Canada.
    00473-05308.jpg
  • Young male walrus (Odobenus rosmarus) portrait, Svalbard, Norway
    D1904481.jpg
  • Lesser scaup (Aythya affinis), adult male. Trout Lake, Yellowstone National Park, Wyoming
    D1504274.jpg
  • A male rock ptarmigan in breeding plumage on the tundra. Alaska
    D258705.jpg
  • Northern Pygmy Owl (Glaucidium californicum) male being "mobbed" by a robin during summer in Montana.
    01563-00714-P.jpg
  • Dr. Steven C. Amstrup checks the paw of polar bear (Ursus maritimus) #20571, a large male that had been tagged years earlier. Kaktovik, Alaska
    D123973.jpg
  • Common eider (Somateria mollissima) male in flight. Svalbard, Norway
    D1590405.jpg
  • Bighorn sheep (Ovis canadensis) male also known as a ram. Yellowstone National Park, Wyoming
    D1735645.jpg
  • Polar bear (Ursus maritimus) portrait of large male near Cape Churchill, Manitoba.
    D188890.jpg
  • American robin (Turdus migratorius) dive bombs a northern pygmy owl (Glaucidium californicum) in a mobbing behavior. Montana
    D00005175-P.jpg
  • A large very old, solitary muskox bull with one horn pauses on the tundra with a rising moon. Alaska
    D258552.jpg
  • Northern pygmy owl clutching a baby bird that it's brought back to the nest to feed the female and chicks. Montana
    D00005166-P.jpg
  • Jaguar in a tree overlooking the river. Pantanal, Brazil
    D1511122-P.jpg
  • Denver Holt glasses the grasslands of the Ninepipe National Wildlife Refuge looking for short-eared owls. Montana
    D1679671.jpg
  • Denver Holt of the Owl Research Institute
    D772552.jpg
  • Sage Grouse (Centrocercus urophasianus) male in a courting display.  The males fan their tails and rapidly inflate and deflate their sacs, emitting a loud bubbling, popping sound to attract females.  Charles M. Russell Wildlife Refuge, Montana
    D00022288.jpg
  • Polar bear (Ursus maritimus) pair of males wrestling together on the ice. Hudson Bay, Churchill, Canada
    00473-52115.jpg
  • Polar bear (Ursus maritimus) pair of males wrestling together on the ice. Hudson Bay, Churchill, Canada
    00473-52216.jpg
  • Alaskan Brown Bear (Ursus middendorffi) males fighting. Katmai National Park, Alaska
    00470-23203.jpg
  • Orang-utan (Pongo pygmaeus) large male, Tanjung Puting National Park. Borneo
    D1674699_DxO.jpg
  • Orangutan (Pongo pygmaeus) large male, Tanjung Puting National Park, Borneo
    D1674691.jpg
  • Orang-utan (Pongo pygmaeus) large male, Tanjung Puting National Park. Borneo
    D1674663_DxO.jpg
  • Orang-utan (Pongo pygmaeus) large male, Tanjung Puting National Park. Borneo
    D1674628_DxO.jpg
  • Orang-utan (Pongo pygmaeus) large male yawning, Tanjung Puting National Park. Borneo
    D1674234_DxO.jpg
  • Orang-utan (Pongo pygmaeus) large male, Tanjung Puting National Park. Borneo
    D1674230_DxO.jpg
  • A large male Northern Elephant Seal known as the Beach Master charges towards a competing male in California.
    01033-20412.jpg
  • A pair of male polar bears (Ursus maritimus) wrestling on the ice. Hudson Bay, Churchill, Canada
    00473-52306.jpg
  • A silver-black male mountain gorilla ((Gorilla beringei beringei)) in Volcanoes National Park. Rwanda, Africa
    00868-02018.jpg
  • A large male polar bear (Ursus maritimus) walking along Hudson Bay near Churchill, Manitoba. Canada.
    D00014171.jpg
  • Alaska brown bear (Ursus middendorffi) mother fighting a male bear, with her cubs nearby. Alaska Peninsula, Alaska
    00470-19408.jpg
  • A large male polar bear walking along the shores of Hudson Bay. Manitoba, Canada
    D00014091.jpg
  • A large male black bear (Ursus americanus) foraging for food in frosty grasses at the edge of a beaver pond. Minnesota
    00471-17218.jpg
  • Alaska brown bear (Ursus middendorffi) mother fighting a male bear, with her cubs nearby. Alaska Peninsula, Alaska
    00470-19409.jpg
  • Alaska brown bear (Ursus middendorffi) mother fighting a male bear, with her two cubs nearby. Alaska Peninsula, Alaska
    00470-19407.jpg
  • A female polar bear charges an intruding male and her cub follows suit.
    00473-05511.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from a large, immobilized male polar bear (Ursus maritimus). Kaktovik, Alaska
    D123954.jpg
  • A male giraffe (Giraffa camelopardalis) eating from a tree. Kenya, Africa
    D000080079.jpg
  • Orangutan (Pongo pygmaeus) large male, Tanjung Puting National Park, Borneo
    D1674279.jpg
  • Orangutan (Pongo pygmaeus) large male, Tanjung Puting National Park. Borneo
    D1673659.jpg
  • A large male orangutan (Pongo pygmaeus) feeding on sugarcane at a feeding station in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1582222.jpg
  • A large male orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1580777.jpg
  • A large male Orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1580668.jpg
  • A large male Orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1580640.jpg
  • A large male Orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1580590.jpg
  • A large male Orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1580548.jpg
  • A large male Orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region., Borneo.
    D1580514.jpg
  • A large male polar bear with the remains of a cub of the year he caught and killed from a female polar bear near Cape Churchill.
    D236455.jpg
  • A large male polar bear with the remains of a cub of the year he caught and killed from a female polar bear near Cape Churchill.
    D236347.jpg
  • Black Bear (Ursus americanus) male soaked from drenching rain with its head on a tree on an island in a cedar swamp.  Minnesota
    00471-05610.jpg
  • Alaskan Brown Bear adult male mounts and mates with a female. Alaskan Peninsula, Alaska
    00470-04802.jpg
  • African Lion (Panthera leo) mature male. Masai Mara National Reserve, Kenya, Africa
    17275-04903.jpg
  • King penguin (Aptenodytes p. patagonica) male and female courting prior to mating. Right Whale Bay
    00581-03316.jpg
  • Polar Bear male on ice flow in the Northwest Territories, Canada.
    00473-00110.jpg
  • Mountain Bluebird male near a nest. Montana
    00611-00111.jpg
  • A large male Bison forages along the Madison River. Yellowstone National Park, Wyoming
    D191781.jpg
  • Dr. Steven Amstrup and Eric Regehr with a large male polar bear on the Beaufort Sea in Alaska.
    D169626.jpg
  • A male wild turkey with a fanned tail strutting for a female during the spring. Minnesota
    00710-00208.jpg
  • Polar Bear (Ursus maritimus) large male. Churchill, Manitoba, Canada
    00473-38811.jpg
  • Polar Bear (Ursus Martimus) female charges an intruding male, and her cub follows suit. Churchill, Manitoba, Canada
    00473-05514.jpg
  • Polar Bear (Ursus maritimus) a large male lies immobilized on the ice as Dr. Steven Amstrup and his assistant head for a female that was darted at the same time and is down on the ice. Beaufort Sea, Alaska
    D170397.jpg
  • Orangutan (Pongo pygmaeus) large male, Tanjung Puting National Park, Borneo
    D1673740.jpg
  • A young male orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1581953.jpg
  • A large male orangutan (Pongo pygmaeus) along a forest trail in Tanjung Puting National Park. Central Kalimantan region, Borneo
    D1581708.jpg
  • A large male orangutan (Pongo pygmaeus) along a forest trail in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1581694.jpg
  • A large male orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1580705.jpg
  • A large male orangutan (Pongo pygmaeus) in Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1580773.jpg
  • A large male (Pongo pygmaeus) in Orangutan Tanjung Puting National Park. Central Kalimantan region, Borneo.
    D1580522.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking blood from an immobilized large male polar bear.
    D123997.jpg
  • A male snowy owl (Bubo scandiacus) bringing a brown lemming to the nest site. Alaska
    D763424.jpg
  • A male snowy owl (Bubo scandiacus) in flight carrying a brown lemming. Alaska
    D763228.jpg
  • A large male polar bear with the remains of a cub of the year he caught and killed from a female polar bear near Cape Churchill.
    D236426.jpg
  • A large male polar bear with the remains of a cub of the year he caught and killed from a female polar bear near Cape Churchill.
    D236170.jpg
  • A male Polar Bear in very high winds near Cape Churchill, Manitoba, Canada.
    D00045323.jpg
  • Alaskan Brown Bear (Ursus middendorffi) large male resting on driftwood. Katmai National Park, Alaska
    00470-22408.jpg
  • Yellow Warbler (Dendroica petechia) male in a tree. Lobos Island, Galapagos, Ecuador
    D198357.jpg
  • Karyn Rode prepares to take data from a large male polar bear on the ice pack of the Beaufort Sea, Alaska.
    D125251.jpg
  • Polar Bear male wandering at Cape Churchill on the shores of Hudson Bay near Churchill, Manitoba, Canada.
    D00039632.jpg
  • A large male black bear uses a cedar tree for a headrest while napping in the pouring rain. Minnesota
    00471-05711.jpg
  • Alaskan Brown Bear male resting on a piece of driftwood. Katmai National Park, Alaska
    00470-22503.jpg
  • Polar Bear (Ursus maritimus) male waiting for the bay to freeze. Hudson Bay, Cape Churchill, Canada
    00473-53714.jpg
  • Mountain Gorilla (Gorilla gorilla beringei) male silverback yawning in Volcanoes National Park in Rwanda, Africa.
    00868-01005.jpg
  • A yearling male black bear (Ursus americanus) finds refuge in the crook of a branch in a tree. Minnesota
    00471-07302.jpg
  • A male black bear (Ursus americanus) rests on a moss-covered log in a rain-soaked forest during early fall in Minnesota.
    00471-05812.jpg
  • Northern Pygmy Owl (Glaucidium gnoma) male perched while hunting during summer in western Montana.
    01563-00706.jpg
  • A male Polar Bear wanders the edge of Hudson Bay at Cape Churchill near Churchill, Manitoba, Canada.
    D00039151.jpg
  • A portrait of a mature male lion in the Serengeti Plains. Masai Mara National Reserve, Kenya, Africa
    17275-01715.jpg
  • Dr. Steve Amstrup, USGS biologist, prepares to take data from a large male polar bear on the Beaufort Sea ice pack. Kaktovik, Alaska
    D125753.jpg
  • Steve Amstrup, lead USGS biologist, taking field data from an immobilized large male polar bear. Kaktovik, Alaska
    D123981.jpg
  • A large male polar bear (Ursus maritimus) losing coordination from the immobilizing drug he was darted with.
    D124176.jpg
  • A large male polar bear (Ursus maritimus) gets a ride in a helicopter sling on its way to be released back into the wild near Hudson Bay, Manitoba.
    D234744.jpg
  • A large male bison, Yellowstone National Park, Wyoming.
    D191740.jpg
  • A male polar bear (Ursus maritimus) checks out the camera on Buggy One. Cape Churchill, Manitoba
    D146896.jpg
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